CET EKG Technician Skills and Knowledge Base 2

Question 1

Which lead placement error would cause an inverted P wave in lead I?

Accepted Answer

Right and left arm electrodes reversed

Answer

Right leg and left arm electrodes reversed

Answer

V1 placed too high on the chest

Answer

Left leg electrode placed on the abdomen

Question 2

A patient has a heart rate of 150 bpm with narrow QRS complexes and no visible P waves. Which rhythm is most likely?

Accepted Answer

Junctional tachycardia

Answer

Atrial flutter

Answer

Atrial fibrillation

Answer

Ventricular tachycardia

Question 3

What is the normal PR interval range on an adult EKG?

Accepted Answer

0.12–0.20 seconds

Answer

0.06–0.10 seconds

Answer

0.20–0.28 seconds

Answer

0.04–0.08 seconds

Question 4

During a Holter monitor application, why is it important to abrade the skin before attaching electrodes?

Accepted Answer

To remove dead skin cells and oils that increase impedance

Answer

To increase patient discomfort as a reminder to wear the monitor

Answer

To mark electrode placement sites for later reference

Answer

To sterilize the skin and prevent infection

Question 5

Which of the following is a characteristic of first-degree AV block?

Accepted Answer

PR interval greater than 0.20 seconds with every P wave conducted

Answer

Some P waves are not followed by a QRS complex

Answer

Progressive PR lengthening until a QRS is dropped

Answer

Complete dissociation between P waves and QRS complexes

Question 6

Which precordial lead is placed at the 4th intercostal space, right sternal border?

Accepted Answer

V1

Answer

V2

Answer

V3

Answer

V4

Question 7

A QRS complex wider than 0.12 seconds most commonly indicates:

Accepted Answer

Bundle branch block or ventricular origin

Answer

First-degree AV block

Answer

Sinus bradycardia

Answer

Atrial enlargement